I actually do a lot of yoga online. I really like Melissa West's youtube channel (https://www.youtube.com/user/DrMelissaWest). The meditation at the begining can be a little hokey for some people, but I'd suggest trying to do 3 or 4 all the way through before making a decision. I started doing yoga regularly less than a year ago and it's seriously changed my life.

well those all sound like wonderful things. I am getting ancient so staying flexible is important to me. I also want to use it to stay centered, as you suggest. I have been to a couple classes over the year, but I have been traveling for work so much it is inconsistent.